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| author | Keerthy <j-keerthy@ti.com> | 2015-08-18 15:11:16 +0530 |
|---|---|---|
| committer | Alexandre Belloni <alexandre.belloni@free-electrons.com> | 2015-09-05 19:37:21 +0200 |
| commit | 399cf0f63f6f24d7a837fbfbc801010cb6e77579 (patch) | |
| tree | a2a48fe8f0a07fac664f91149925c378e4f126a1 /drivers/rtc | |
| parent | 532409aa1ba8b69d5a3dea159d4b1bd9adbd7a46 (diff) | |
| download | linux-stable-399cf0f63f6f24d7a837fbfbc801010cb6e77579.tar.gz linux-stable-399cf0f63f6f24d7a837fbfbc801010cb6e77579.tar.bz2 linux-stable-399cf0f63f6f24d7a837fbfbc801010cb6e77579.zip | |
rtc: omap: Add external clock enabling support
Configure the clock source to external clock if available.
External clock is preferred as it can be ticking during suspend.
Signed-off-by: Keerthy <j-keerthy@ti.com>
Acked-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Diffstat (limited to 'drivers/rtc')
| -rw-r--r-- | drivers/rtc/rtc-omap.c | 25 |
1 files changed, 24 insertions, 1 deletions
diff --git a/drivers/rtc/rtc-omap.c b/drivers/rtc/rtc-omap.c index f31c0127dae0..ec2e9c5fb993 100644 --- a/drivers/rtc/rtc-omap.c +++ b/drivers/rtc/rtc-omap.c @@ -108,6 +108,7 @@ /* OMAP_RTC_OSC_REG bit fields: */ #define OMAP_RTC_OSC_32KCLK_EN BIT(6) +#define OMAP_RTC_OSC_SEL_32KCLK_SRC BIT(3) /* OMAP_RTC_IRQWAKEEN bit fields: */ #define OMAP_RTC_IRQWAKEEN_ALARM_WAKEEN BIT(1) @@ -138,6 +139,7 @@ struct omap_rtc { int irq_timer; u8 interrupts_reg; bool is_pmic_controller; + bool has_ext_clk; const struct omap_rtc_device_type *type; }; @@ -555,7 +557,11 @@ static int omap_rtc_probe(struct platform_device *pdev) if (rtc->irq_alarm <= 0) return -ENOENT; - rtc->clk = devm_clk_get(&pdev->dev, "int-clk"); + rtc->clk = devm_clk_get(&pdev->dev, "ext-clk"); + if (!IS_ERR(rtc->clk)) + rtc->has_ext_clk = true; + else + rtc->clk = devm_clk_get(&pdev->dev, "int-clk"); if (!IS_ERR(rtc->clk)) clk_prepare_enable(rtc->clk); @@ -634,6 +640,16 @@ static int omap_rtc_probe(struct platform_device *pdev) if (reg != new_ctrl) rtc_write(rtc, OMAP_RTC_CTRL_REG, new_ctrl); + /* + * If we have the external clock then switch to it so we can keep + * ticking across suspend. + */ + if (rtc->has_ext_clk) { + reg = rtc_read(rtc, OMAP_RTC_OSC_REG); + rtc_write(rtc, OMAP_RTC_OSC_REG, + reg | OMAP_RTC_OSC_SEL_32KCLK_SRC); + } + rtc->type->lock(rtc); device_init_wakeup(&pdev->dev, true); @@ -679,6 +695,7 @@ err: static int __exit omap_rtc_remove(struct platform_device *pdev) { struct omap_rtc *rtc = platform_get_drvdata(pdev); + u8 reg; if (pm_power_off == omap_rtc_power_off && omap_rtc_power_off_rtc == rtc) { @@ -695,6 +712,12 @@ static int __exit omap_rtc_remove(struct platform_device *pdev) /* leave rtc running, but disable irqs */ rtc_write(rtc, OMAP_RTC_INTERRUPTS_REG, 0); + if (rtc->has_ext_clk) { + reg = rtc_read(rtc, OMAP_RTC_OSC_REG); + reg &= ~OMAP_RTC_OSC_SEL_32KCLK_SRC; + rtc_write(rtc, OMAP_RTC_OSC_REG, reg); + } + rtc->type->lock(rtc); /* Disable the clock/module */ |